Code/net/minecraft/world/level/levelgen/flat/FlatLevelGeneratorPresets.java

package net.minecraft.world.level.levelgen.flat;

import com.google.common.collect.ImmutableSet;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import net.minecraft.core.HolderGetter;
import net.minecraft.core.HolderSet;
import net.minecraft.core.registries.Registries;
import net.minecraft.data.worldgen.BootstrapContext;
import net.minecraft.resources.ResourceKey;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.world.item.Items;
import net.minecraft.world.level.ItemLike;
import net.minecraft.world.level.biome.Biome;
import net.minecraft.world.level.biome.Biomes;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.levelgen.placement.PlacedFeature;
import net.minecraft.world.level.levelgen.structure.BuiltinStructureSets;
import net.minecraft.world.level.levelgen.structure.StructureSet;

public class FlatLevelGeneratorPresets {
    public static final ResourceKey<FlatLevelGeneratorPreset> CLASSIC_FLAT = register("classic_flat");
    public static final ResourceKey<FlatLevelGeneratorPreset> TUNNELERS_DREAM = register("tunnelers_dream");
    public static final ResourceKey<FlatLevelGeneratorPreset> WATER_WORLD = register("water_world");
    public static final ResourceKey<FlatLevelGeneratorPreset> OVERWORLD = register("overworld");
    public static final ResourceKey<FlatLevelGeneratorPreset> SNOWY_KINGDOM = register("snowy_kingdom");
    public static final ResourceKey<FlatLevelGeneratorPreset> BOTTOMLESS_PIT = register("bottomless_pit");
    public static final ResourceKey<FlatLevelGeneratorPreset> DESERT = register("desert");
    public static final ResourceKey<FlatLevelGeneratorPreset> REDSTONE_READY = register("redstone_ready");
    public static final ResourceKey<FlatLevelGeneratorPreset> THE_VOID = register("the_void");

    public static void bootstrap(BootstrapContext<FlatLevelGeneratorPreset> p_330734_) {
        new FlatLevelGeneratorPresets.Bootstrap(p_330734_).run();
    }

    private static ResourceKey<FlatLevelGeneratorPreset> register(String p_226277_) {
        return ResourceKey.create(Registries.FLAT_LEVEL_GENERATOR_PRESET, ResourceLocation.withDefaultNamespace(p_226277_));
    }

    static class Bootstrap {
        private final BootstrapContext<FlatLevelGeneratorPreset> context;

        Bootstrap(BootstrapContext<FlatLevelGeneratorPreset> p_330950_) {
            this.context = p_330950_;
        }

        private void register(
            ResourceKey<FlatLevelGeneratorPreset> p_256174_,
            ItemLike p_255748_,
            ResourceKey<Biome> p_256483_,
            Set<ResourceKey<StructureSet>> p_255807_,
            boolean p_256642_,
            boolean p_256006_,
            FlatLayerInfo... p_255913_
        ) {
            HolderGetter<StructureSet> holdergetter = this.context.lookup(Registries.STRUCTURE_SET);
            HolderGetter<PlacedFeature> holdergetter1 = this.context.lookup(Registries.PLACED_FEATURE);
            HolderGetter<Biome> holdergetter2 = this.context.lookup(Registries.BIOME);
            HolderSet.Direct<StructureSet> direct = HolderSet.direct(p_255807_.stream().map(holdergetter::getOrThrow).collect(Collectors.toList()));
            FlatLevelGeneratorSettings flatlevelgeneratorsettings = new FlatLevelGeneratorSettings(
                Optional.of(direct), holdergetter2.getOrThrow(p_256483_), FlatLevelGeneratorSettings.createLakesList(holdergetter1)
            );
            if (p_256642_) {
                flatlevelgeneratorsettings.setDecoration();
            }

            if (p_256006_) {
                flatlevelgeneratorsettings.setAddLakes();
            }

            for (int i = p_255913_.length - 1; i >= 0; i--) {
                flatlevelgeneratorsettings.getLayersInfo().add(p_255913_[i]);
            }

            this.context.register(p_256174_, new FlatLevelGeneratorPreset(p_255748_.asItem().builtInRegistryHolder(), flatlevelgeneratorsettings));
        }

        public void run() {
            this.register(
                FlatLevelGeneratorPresets.CLASSIC_FLAT,
                Blocks.GRASS_BLOCK,
                Biomes.PLAINS,
                ImmutableSet.of(BuiltinStructureSets.VILLAGES),
                false,
                false,
                new FlatLayerInfo(1, Blocks.GRASS_BLOCK),
                new FlatLayerInfo(2, Blocks.DIRT),
                new FlatLayerInfo(1, Blocks.BEDROCK)
            );
            this.register(
                FlatLevelGeneratorPresets.TUNNELERS_DREAM,
                Blocks.STONE,
                Biomes.WINDSWEPT_HILLS,
                ImmutableSet.of(BuiltinStructureSets.MINESHAFTS, BuiltinStructureSets.STRONGHOLDS),
                true,
                false,
                new FlatLayerInfo(1, Blocks.GRASS_BLOCK),
                new FlatLayerInfo(5, Blocks.DIRT),
                new FlatLayerInfo(230, Blocks.STONE),
                new FlatLayerInfo(1, Blocks.BEDROCK)
            );
            this.register(
                FlatLevelGeneratorPresets.WATER_WORLD,
                Items.WATER_BUCKET,
                Biomes.DEEP_OCEAN,
                ImmutableSet.of(BuiltinStructureSets.OCEAN_RUINS, BuiltinStructureSets.SHIPWRECKS, BuiltinStructureSets.OCEAN_MONUMENTS),
                false,
                false,
                new FlatLayerInfo(90, Blocks.WATER),
                new FlatLayerInfo(5, Blocks.GRAVEL),
                new FlatLayerInfo(5, Blocks.DIRT),
                new FlatLayerInfo(5, Blocks.STONE),
                new FlatLayerInfo(64, Blocks.DEEPSLATE),
                new FlatLayerInfo(1, Blocks.BEDROCK)
            );
            this.register(
                FlatLevelGeneratorPresets.OVERWORLD,
                Blocks.SHORT_GRASS,
                Biomes.PLAINS,
                ImmutableSet.of(
                    BuiltinStructureSets.VILLAGES,
                    BuiltinStructureSets.MINESHAFTS,
                    BuiltinStructureSets.PILLAGER_OUTPOSTS,
                    BuiltinStructureSets.RUINED_PORTALS,
                    BuiltinStructureSets.STRONGHOLDS
                ),
                true,
                true,
                new FlatLayerInfo(1, Blocks.GRASS_BLOCK),
                new FlatLayerInfo(3, Blocks.DIRT),
                new FlatLayerInfo(59, Blocks.STONE),
                new FlatLayerInfo(1, Blocks.BEDROCK)
            );
            this.register(
                FlatLevelGeneratorPresets.SNOWY_KINGDOM,
                Blocks.SNOW,
                Biomes.SNOWY_PLAINS,
                ImmutableSet.of(BuiltinStructureSets.VILLAGES, BuiltinStructureSets.IGLOOS),
                false,
                false,
                new FlatLayerInfo(1, Blocks.SNOW),
                new FlatLayerInfo(1, Blocks.GRASS_BLOCK),
                new FlatLayerInfo(3, Blocks.DIRT),
                new FlatLayerInfo(59, Blocks.STONE),
                new FlatLayerInfo(1, Blocks.BEDROCK)
            );
            this.register(
                FlatLevelGeneratorPresets.BOTTOMLESS_PIT,
                Items.FEATHER,
                Biomes.PLAINS,
                ImmutableSet.of(BuiltinStructureSets.VILLAGES),
                false,
                false,
                new FlatLayerInfo(1, Blocks.GRASS_BLOCK),
                new FlatLayerInfo(3, Blocks.DIRT),
                new FlatLayerInfo(2, Blocks.COBBLESTONE)
            );
            this.register(
                FlatLevelGeneratorPresets.DESERT,
                Blocks.SAND,
                Biomes.DESERT,
                ImmutableSet.of(BuiltinStructureSets.VILLAGES, BuiltinStructureSets.DESERT_PYRAMIDS, BuiltinStructureSets.MINESHAFTS, BuiltinStructureSets.STRONGHOLDS),
                true,
                false,
                new FlatLayerInfo(8, Blocks.SAND),
                new FlatLayerInfo(52, Blocks.SANDSTONE),
                new FlatLayerInfo(3, Blocks.STONE),
                new FlatLayerInfo(1, Blocks.BEDROCK)
            );
            this.register(
                FlatLevelGeneratorPresets.REDSTONE_READY,
                Items.REDSTONE,
                Biomes.DESERT,
                ImmutableSet.of(),
                false,
                false,
                new FlatLayerInfo(116, Blocks.SANDSTONE),
                new FlatLayerInfo(3, Blocks.STONE),
                new FlatLayerInfo(1, Blocks.BEDROCK)
            );
            this.register(
                FlatLevelGeneratorPresets.THE_VOID, Blocks.BARRIER, Biomes.THE_VOID, ImmutableSet.of(), true, false, new FlatLayerInfo(1, Blocks.AIR)
            );
        }
    }
}